Trying to remove the rust I found on the ceiling after removing the headliner (72 Satellite Sebring Plus). Used 80 grit for a couple of hours the first two days, which made a loud scraping sound but never got down to bare metal. Switched to 60 grit which was even louder and got down to bare metal in a small spot I concentrated on for a long time. Now I'm beat. At the same time, used some type of orange stringy/spaghetti/nylon type product on my portable drill, which seemed to polish the rust surface more that knock it off. Trying to be careful so I don't damage/affect the newly painted vehicle by heat or too by applying too much pressure. Now i am willing to try anything that will not heat up the metal and damage the fresh paint. Anyone tried those open mesh silicon carbide discs or the poly carbide ones? I guess I would need to find the portable angle grinder for those. Wish I could use my Dremel tool, but this is turning out to be a BIG job. Don't know how I will get all the nooks and crannies clean either. What a mess. The foto does not show the rust I found after removing the insulation. Should of done this first, before completing all the exterior bodywork and paint.